Excavator-tooth.



N. M. DlCKSON.

ExcAvAToR mow.

ucATIoN man :une 16. i916.

.Patented Feb.20,1917. i

sTATEs 4railBEN'r oFFicE.

" i Neiman' iairamr Monson, or1 CHICAGO, ILLINOIS.

nXoAvA'ron-Toorn.

To all-whom it may conce/rn:

Be it known that I, NORMAN MURRAY Dioisoiv,` citi'zenjof the United` States, residinget Chicago,- in the county of Cook and 'State' of Illinois, have invented certain inew and useful Improvements in Excavator-Teeth; endl do hereby ldechire the toilowing to be a full, clear, and exact descrip- I tion'oi vthe invention9 such :is `will enable thers skilled in the art to which it apper-` tains'to make and use the same. y

My invention relates to excevatorbuclrets and has specialfieterencc to` an improvedl'tooth for the ciitting such 'a bucket.' l y The object ofiny invention Iis to provide a stantially as Solidl and rigid as e one-piece A' further object of my invention is to 'provide a'coniiectioii between the point and the base whichfcanbe readily ,and cheaply produced, whichpehall hold lthe point with strength against the lsevere -straiifisj-A to which snchjdevicee are subjected,

i' and which shall prevent the; point from changing it'sshapdwhile in use, end which, thereforel permits vthe-'easyreiiioval erre# vers'al or'` the point wheirdesired. f

tures of constrii .My invention consistskii the several fee- :ibleolv to 4attain the above-menticned land i scribed' and particularly. pointed ont` the appended claims.4

invention c kstood by reference to'ftlief accompanying- -"draw ings formingapart 'of'this specification, and inwhich: 1

' illibejinore'reedily under- Figure alexis affraginentarytop plan view of an excavator-tooth embodying my i inventioinfv i a .y

" Fig'. isy a :vertical 'longitudinal sectiona-lzvewonfthe line le-Zot Fig. 1.1 n

,. Fig. -.-3- istV .vertical croesfeectionai view v Speeication of Letters Patent. Patented Feb. 2Q, 1917., `Appunto@ inea Jandia, 191e. seriai iro. 104,102.

or scraping edge of;

- spectively, of the pointu.

The/,connection betweenthe tooth andthe tion` sind the arrangements l A gv and combinations of parts whereby'lj am en- 40 L'other fobjectsfend allv as hereinafter de# upper surface of Fig. el is. a perspective view 'of the key.

'Ain excavator tooth a relatively heavy massive 'device and the only part which is subject to an appreciablev wear is theffor# ward end or cutting edge. For purposes of economy in the use ofmetel, and for conenient renewal. the point is inside remov- "able `This also permits the point to bev made of a different grade omaterial than f the Vbody ofthe` tooth. .usually the point is made harder thanl thev main part'ot `the f' tooth in 'order to better withstand the weer and tear ofuse.

ln said drawings A is the point ofthe tooth, B isfthe base; and C represents the forward edge of, an' excavator bucketfto.

which the tooth is adapted to be secured byv 'rivets D. The bese'B is provided with a slot E to receive the edgevof the bucket and the rivet D passes through the` upper and `lower parts ofthe base and bindsv the tooth firmly upon the bucket edge.

The point ,il is wedgefshaped, the point ory edge 'of the' wedge forming the Jforward or cutting edge F of the point, ind the inclined Sides Ofc arrang t() theV upper and.lo.\versurfaces1 Gr` and H rebase is vsuch that these parts are'engaged with and dsengagedfrom enchother by areletive' lateralv inoveinent'and 1s vfurther so constructed. Vand arranged that all strains 'i and stresses to which the tooth is 'subjected during excavation in a general direction longitudinally of the tooth or in vertical planes parallel or substantially parallel with the side'faces thereo'exert a tension ona `psirt of the base suiiiciently strongto resist the'sam'e, and also exert apressure von ali-y other part of. the base ampiy tobearthe same. In use the excavator bucket is forced forf v Ward intorthe materialto Abe removed, the

"ceeth'on the forward .edge entering, cutting and loosening the material. Preferably the lower face of the tooth is' in aplane'coincide'nt with that of the hase and which ispi'eferablyparallel with the bottom ofthe bucket. Consequently the the point projects 11p-lf, wardlyfrom theedge of the point, in `posi-y' tion to receive strains which tendto tip ory strong enough I lowerV face of .the

force the point downwardly and pry it oil' of the base. In other words, the Strains and 4synnnetrical so that the tooth can be placed upon the base with either inclined face G or H uppermost. rl`his reversibility adds to`-` the life 'of the tooth for when it is partly worn off and the upper surface then projects at too great an angle to the horizontal, the tooth is turned over and the substantially unworn lower surface present-s the proper angle lo the material being cxcavated.

i provide the rear end ot the point with a contrai tra nsversc slot or'opening J which extends troni side to side ot' the point and provides the point with an upper and a lower rearwardly projecting arn'i K, and I provide the forward end of the tooth base l with a. projecting end L adaptedto tit closely within said transverse slot .I and substantially lill` same. At the point where the projection L joins the niain body of the base I provide transversely extending upper and lower parallel grooves or Slots M, and l foi-1n these slots of dove-tail shape havinga narrow mouths N. I arrange the front walls of these slots in a coincident plane and substantially at right angles to the central plane of the tooth. The forward' walls of the slots M are the rear walls of the upper and lower transverse. ribs P. I decrease the vertical thickness of the projection L beyond the ribs P to correspond with the decreasing thickness; of the point, and for the purpose of providing sulhcient 'metal for proper strength in said upper and lower -arms K. The extreme point of the projection T is tapered as shown, for the same purpose.

As described, the projection L and the slot J which receives it are shaped like an arrow head.

I torni the cxtreme rear ends of said arms K with transverse dove-tail ribs R which are adapted to lit within the grooves M in the base and lock the two parts together against relative longitudinal movement, The rear surfaces S of these ribs are in rlined inwardly and rearwardly and bear against the similarlyinclined rear walls T of the slots M, consequently any rearward thrust against the .point which is transmitted to these parts does not tend to open up or spread the arms M, of the point, vbut rather tends to make them bind upon the projection L more tightly. Furthermore, the rear walls T of the slots M overhang the BEST AVAILABLE coP Lenssen ribs R of the point and resist any' force which would tend to spread the arms M and thus free the point A from the base.

It will be observed that during excavation, the face H of the tooth is presented to the earth and is subjected to strain and wear. IIhe resistance oii'ered .by the eartl. to the face Il ot' the tooth will tend to turn said tooth on the point of the projection Q. as a ulcruni. This would impart a tension strain on the projection l) nearest adjacent the tace ll and a compression strain uponl the walls' of the V-shaped recess or slot M at thelower end or edge of the base, both oi said parts being aniply strong,Y enrnigh to rcsist such strains and It should he understood that while the drawings illustrate the joint between the point and' the base as being very clos. and accurate, in practice this joint is usually slightly open, there being just ree'don1 enough provided to permit the point to he easily entered sidewise into place upon the base. j i

To hold the point against transverse re,- nxoval once it has been placed in position, I provide a thin flat key U and I provide the point, and the j'nojection L withI regist ri ine; openings V and lV respeetivclyg'to reeeivejthis key. The key extends through the parts at right angles to the'cen ral plane of the. point, and I provide the o ter ends of the openings V with large flat bottomed recesses A', one at each side to"`receive the head U of the key and the Anut U" with which the'ikey is secured in place. ,The two recesses A are exactly similar, the bottoms thereof being parallel to the central plane ot the point and parallel with each other so that whichever opening,l receives the nut 'it will bear squarely upon the bottom thereof. The point of the wedge is provided with a screw-threaded U to receive the nut U.

,The head U conforms with and fills the recess A in which it is received, and I arrange the key with the head in the upper side ot the point, consequently this upper side is substantially smot-'h and without any depression which would offer wearing edges. In assembling the point upon the base, the point is placed sidewise into position. the several ribs sliding into ,their respective grooves, and when placed centrally upon the. hase the key openings register and the key is then driven down into position, being finally locked against removal by the nut.

In excavating in stony ground, it will be obvious that the excavator tooth will side` swipe, large stones and pebbles firmly ernbedded in the earth, thereby subjecting the joint between the tooth and base to severe 4 lateral or torsional strain which is, of

recesses adapted to receive said ing spreading of the same.

lso

fihaving such strains. It will be seen that .in the construction illustrated the key is relatively arge and presents a large area to resist all lateralor torsional strains, and further that the end of the base is solid and, therefore,

fwill not spread under the influence of lateral or torsional strains.

having equal divergent arms equipped with inwardly extending projections at their free ends, and a hase provided with a projection adapted to enter and fill the space between said arms and provided with edge recesses adapted to receive said projections for preventing-relative longitudinal novenient of said parts, said tooth reversibl onsaid ba'se for alternately presenting opposite edges of said tooth to wear.

2. An excavator tooth comprising a point having equal divergent arms equipped with inwardly extending projections 'at their free ends, anda base provided with a projection adapted to enter and ll the space between s aid arms and provided with edge recessesadapted to receive said projections for preventing relative longitudinal move` Iment of/said parts, said tooth reversible on :said base for alternately presenting oppogste edges ofsaid tooth to wear, said pro- `ection on said base extending at an angle to the longitudinal axis :the wearing edge of the tooth is disposed flush with one'edge ofthe base.

3. An excavator tooth comprising a point equal divergent arms equipped with inwardly extending projections at their free and a base provided with a projec- 'ition adapted to enter and fill the space between said arms and provided with edge projections for preventing relative longitudinal movement of said parts, a wall of each of said L'recesses overhanging and engaging the free ds of the arms of said tooth for prevent- 4. An excavator tooth comprising a point having equal divergent arms equipped with ends, and a base provided with a projection adapted to enter and fill the space be-l base for alternately presenting opposite edges ofsaid tooth to wear, and a key engaging in openings in said` arms and ,an

adapted to receive said thereof, whereby ending in identical recesses inwardly extending projections at their free opening in said projection of said base for preventing relative lateral movement of said arts. p 5. Anexcavator tooth comprising a point having equal divergent arms equipped with inwardly extending projections at their f ree ends, and a base provided with a projection ada ted to enter and fill the space between sai arms and provided with edge www:

projections for preventing relative longitudinal movement of said arts, said tooth reversible on said base for a ternately presenting opposite edges of said tooth to wear, and a key engaging in openingsin said arms and an opening in said projection of said base for preventing relative lateral movement of said parts, a

preventing relative longitudinal movement of said parts, said tooth reversible on said base for alternately presenting opposite edges of said tooth to wear, a key engagingin openin in said arms and an opening in said projection of said base for preventingrelative lateral movement of said parts, a head at one end of said key, a threaded shank at the other end thereof, and a nut for said shank, said head and -nut adapted to be interchangeably received in recesses in the edges of arms of the point.

An excavator tooth comprising a base and a wedge-shaped point adapted to barewith a. central transverse slot in its rear end providing upper and lower rearwardly projee-ting symmetrical arms, the base having a projection fitting between said arms, the

base and point provided with vertical registering slots for receiving a key, said key slot in the upper and lower sides of the point, a key fitting in said slot and having ahead on one end adapted to filll one of said recesses, and a screwthreaded point on the other end, a nut on said screw-threaded end received in said other recess.

In testimony whereof I have signed my name 'in presence of two subscribing Witnesses. l

NORMAN MURRAY DICKSON. Witnesses:

M. M. Bom,

R. W. LoTz.

iot movably secured on the base and provided 

